Paper making



Feb. 17. 1925.

L. FJRSCHBRAUN PAPER MAKING Filed Nov. 4, 1921 Patented Feb. 17, 1925.

LESTER KIRSCHBRAUN,

OF CHICAGO, ILLINOIS.

PAPER MAKING.

Application filed November 4, 1921. Serial No. 512,808.

To all whom it may concern:

Be' it known that I, LESTER IfiRsoHBRAUN,

. a citizen of the United States, residing in tainers.

I have heretofore invented numerous improvements in the art of water-proofing paper, in which an asphaltic or bituminous medium is incorporated in the fibrous stock as the stock is being formed into a webon the usual types of paper-forming machinery. his is accomplished by forming the asphalt'into a non-adhesive emulsion of asphalt and water, in which the water forms the external and the asphalt the internal phases respectively of the emulsion.

The present invention is not directed specifically to the manner of forming the emulsion in question.

WVhile by means of my prior processes above referred to I have producedwaterproof paper which is impervious against water in a liquid phase, there hasbeen more or less tendency for moisture in the form of vapor-laden air to pass through the paper.

The object of the present invention is to provide a novel product, process and apparatus for preventing this. ject of theinvention to accomplish this result in such a way as to be able to use the usual multi-cylinder machine for making paper in carrying out the process, with such additions as form the novel feature of the other forms of bitumens, hydro-carbons or It is a further ob pitchy materials may be used-all possessing water-proofing qualities. An invention may be carried out using this basic idea in which the water-proofing constituent may perhaps not necessarily be in a non-adhesive form so long as it is not brought directly into contact with any of the elements of the paper machine which would tend to gum up or interfere withthe paper forming operation.

To more clearly understand the invention, I have drawn the accompanying drawing, in which Fig. 1 is a somewhat diagrammatic view of a part of a -multi-cylinder paper machine, equipped with my invention.

Figs. 2 and 3 are diagrammatic plans of the spraying apparatus, by which the aspalt is applied to the fibrous web.

Referring to the drawings, 1 designates a vat containing cylinder mould 2, on which is formed the fibrous web 3, carried by the underside of the blanket 4. 5 designates a second vat, containing the cylinder moul'd 6, on which is formed a second web 7. 8 and 9 designate couch rolls, 10 the suction box, and 11 a series of press rolls, with which the usual multi-cylinder machine is equipped.

Between the vats 1 and 5 is interposed a spraying device designated as a whole 12,.

conslsting of a series of transversely disposed headers 13, each equipped with a plurality of upwardly extending atomizing nozzles 14. The spraying device'is equipped with suitably controlled valves (not shown), whereby any one or more of the manifold nozzles. may be used independently of the other. 1

Above the vat 5 is suitably mounted a transversely disposed manifold 15, containing a-wpl'urality of atomizing nozzles 16, the nozzles being inclined upwardly so as to project the asphalt mould into the nipple between the incoming ply and the cylinder mould.

By means of the apparatus shown, the emulsion may be sprayed either through the nozzles 14 across the entire face of the sheet so as to produce a' continuous film of any desiredthickness, which film is substantially pure asphalt free from a fibre. Also, if-

esired, an asphalted film may be formed by forcing the non-adhesive emulsion through the nozzles 16; or, if desired, either the nozzles 16 or the nozzles 14 may be used alone.

.by mixing In order to facilitate the retention of the asphalt and to avoid interference with the formation and oouching of the sheet, it is desirable to carry the suction in the cylinder moulds as low as possible to produce the driestweb capable of retaining the emulsion without disturbance.

I have described the formation of two fibrous webs formed of" paper stock only united by a continuous film of non-porous asphalt. However, in some cases it may be desirable to make the webs themselves of asphalted stock, which may be accomplished the non-adhesive emulsion with the pulp in each vat and between the webs formed of such stock interpose the film of asphalt by means of the spraying devices heretofore described. By using asphalted stock in this manner, the sprayed. film of asphalt need not be so heavy, as the absorption of the asphalt into the paper plies is lessened on account of the presence of the asphalted stock. 4

I claim as my invention:

1. A moisture proof sheet of paper, consisting of a plurality of webs united by means of a film formed of an asphalt and an emulsifying agent.

2. A moisture. proof sheet of paper, consisting of a plurality of webs united by means of a film formed of a bituminous substance and an emulsifying agent, said bituminous film being substantially non-p orous and devoid of fibrous stock.

3. A process of making a moisture proof sheet, consisting in forming a plurality of fibrous webs, and during such sheet-forming operations, inter osing between the webs a moisture proof 1m of pitchy material.

4:. A process of making a moisture proof sheet, consisting in forming a plurality of fibrous webs, and during such sheet-forming operation, interposing between the webs a moisture proof film of pitchy material forming. a continuous barrier.

5. A process of making moisture proof paper consisting in forming a plurality of fibrous webs, and applying between the webs a hydrocarbon, emulsion in non-adhesive form.

6. A process of making moisture proof paper consisting in forming a'plurality of fibrous webs, and simultaneously applying between the Webs a hydrocarbon waterproofing agent substantially non-porous and devoid of fibrous stock.

7 A moisture proof sheet of paper consisting of a plurality of Webs united by means of a film formed'of a flexible fusible waterproof binder and an emulsifying agent.

8. A process of making a moistureproof paper consisting in forming a plurality of fibrous webs and applying between the webs a pitchy emulsion in non-adhesive form and subsequently applying heat to coalesce the pitchy substance, and forming a moisture proof barrier.

'9. A multi-ply sheet having continuous films of pitchy material constituting a moisture proof barrier between the simultaneously formed fibrous plies.

10. A moistureproof sheet conisting of a plurality of webs united by a waterproof binder, said binder comprising a film of pitchy material between plies characterized by simultaneous formation.

11. A moistureproof sheet consisting of a plurality of webs united by a moistureproof binder, said binder taking the form of a continuous film of pitchy material between the plies and characterized by simultaneous formation.

12. The process of making moisture-proof paper which consists in forming a plurality of fibrous webs and applying between the webs a film of pitchy material in an aqueousvehicle. v

13. A process of making moisture-proof paper consisting in forming a plurality of 'fibrous Webs and simultaneously applying between the webs a pitchy waterproofing agent substantially non-porous and devoid .of fibrous stock.

'14. A moisture-proof paper comprising a plurality of fibrous plieshaving a barrier of moisture-proof Y substance interposed therebetween-and having the characteristics. of having been applied to the wet formation.

15. A moisture-proof paper comprising-a plurality of fibrous plies, containing a water-' proofing substance and a film of. substam tially fibreless water-proofing substance 1n-. terposed therebetween, said film having the characteristics of having beenapplied in an aqueous vehicle to the wet formation.

LESTER KIRSOHBRAUN. 

